Amaiwa S

Hutton L.A. (1979): Teacher attitudes and student problem solving achievement after one year use of hand calculators in the elementary school, Proceedings of the 3rd PME Conference vol. 1, pp. 117-121. Janvier C. (1979): The use of situations for the development of mathematical concepts, Proceedings of the 3rd PME Conference vol. 1, pp. 122-127. ................
................